objective : iud is a highly effective, safe, private, long-acting, and rapidly reversible method of contraception with few side effects. the aim of this study was to assess the continuation rate and cause of iud discontinuation in isfahan, iran. materials and methods: this historical cohort study wascarried out on 12 randomly selected health centers of isfahan province in 2007. 244 literate mar...

in this study; utilizing the elastic matrix ball has higher processing efficiency and better superficial quality than traditionalgrinding. the diversity of elastic abrasive tool characteristics contact with bend surface results in irregular wear abrasion，and abrasive tool machining status gets complicated. there is no theoretical interpretation of parameters affecting the grinding accuracy. bec...

the abrasive flow machining technique uses a self-deforming tool, an abrasive laden media that is passed back and forth in the passage geometry of the hollow workpiece with the assistance of two hydraulically operated cylinders placed opposite to each other. the material is removed by abrasion generating finer surfaces in the area where flow is restricted. but this method has a low material rem...

the aim of this study was to determine the most suitable shaking frequency and amplitude for shake harvesting esfahan's edible fig (ficus carica cv. sabz). a hand held limb shaker with adjustable shaking frequency and amplitude was used for this study. a 3x3 factorial experiment with three levels of oscillating frequency (10, 12 and 14 hz) and three levels of shaking amplitude (20, 32.5 and 45 ...

in this study the effect of input parameters of the edm process (pulse on-time, duty cycle and tool polarity), on the material removal rate (mrr), tool wear ratio (twr) and maximum surface roughness (rmax) in the machining aisi h13 tool steel has been studied. this study shows that increasing the duty cycle in the two conditions of tool polarity, material removal rate and the maximum surface ro...

in this research, an experimental study to evaluate nutrient removal from synthetic wastewater by a lab-scale moving bed biofilm process was investigated. also, kinetic analysis of the process with regard to phosphorus and nitrogen removal was studied with different mathematical models. for nutrient removal, the moving bed biofilm process was applied in series with anaerobic, anoxic and aerobic...